<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 消息提示 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <!--  步骤条使用  -->
      <el-steps :space="200" align-center :active="activeIndex-0" finish-status="success">
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tabs栏标签页 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          v-model="activeIndex"
          tab-position="left"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <!-- 选择商品分类的级联选择框 -->
              <el-cascader
                expandTrigger="hover"
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"
                clearable
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 循环渲染复选框 -->
              <el-checkbox-group v-model="item.attr_vals1">
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headersObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <!-- 商品内容 -->
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 预览图片对话框 -->
    <el-dialog title="图片预览" :visible.sync="picDialogVisible" width="50%">
      <img :src="previewPath" class="previewImg" alt />
    </el-dialog>
  </div>
</template>
<script>
// 引入lodash深拷贝组件
import _ from 'lodash'
export default {
  // 数据
  data() {
    return {
      // 步骤条对应索引
      activeIndex: '0',
      //   添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        // 上传图片时的临时路径
        pics: [],
        // 富文本编辑器输入的内容
        goods_introduce: '',
        attrs: []
      },
      // 添加商品表单验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请输入商品分类', trigger: 'blur' }
        ]
      },
      //   商品列表
      cateList: [],
      //   配置级联选择器中数据如何展示
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      //   动态参数列表
      manyTableData: [],
      //   静态参数列表
      onlyTableData: [],
      //   上传图片的路径
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 给上传图片设置请求头
      headersObj: {
        Authorization: window.window.sessionStorage.getItem('token')
      },
      // 预览图片的真实路径
      previewPath: '',
      // 图片预览的对话框
      picDialogVisible: false
    }
  },
  //   方法
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品列表失败!')
      }
      this.cateList = res.data
      console.log(this.cateList)
    },
    // 如果用户输入的不是三级分类  则该选择无效
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // tab栏切换验证
    beforeTabLeave(activeName, oldActiveName) {
      if (this.activeIndex === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类!')
        return false
      }
    },
    //  tab栏切换时会触发事件
    async tabClicked() {
      // 获取动态参数
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'many' }
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数失败！')
        }
        res.data.forEach(item => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
          // 复选框双向绑定的数据  和循环的数据需要区分开来
          item.attr_vals1 = item.attr_vals
        })
        this.manyTableData = res.data
        console.log(this.manyTableData)
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'only' }
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数失败！')
        }
        this.onlyTableData = res.data
        console.log(this.onlyTableData)
      }
    },
    // 处理图片预览的方法
    handlePreview(file) {
      // 先保存图片的真实路径
      this.previewPath = file.response.data.url
      this.picDialogVisible = true
      console.log(file)
    },
    // 移除图片的方法
    handleRemove(file) {
      // 1.获取想要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics数组中 找到这个图片对应的索引
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3.调用splice方法 将这个图片删除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm.pics)
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      const picInfo = { pic: response.data.tmp_path }
      this.addForm.pics.push(picInfo)
      console.log(this.addForm.pics)
    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('添加商品失败!')
        }
        // 深拷贝添加数据 改成服务器想要的类型
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理attrs数组，数组中需要包含商品的动态参数和静态属性
        // 将manyTableData（动态参数）处理添加到attrs
        this.manyTableData.forEach(item => {
          form.attrs.push({
            attr_id: item.attr_id,
            attr_value: item.attr_vals1.join(' ')
          })
        })
        // 将onlyTableData（静态属性）处理添加到attrs
        this.onlyTableData.forEach(item => {
          form.attrs.push({
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          })
        })
        // 发起请求
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败!')
        }
        this.$message.success('添加商品成功!')
        // 编程式导航跳转到商品列表页面
        this.$router.push('/goods')
      })
    }
  },
  //   生命周期函数
  created() {
    this.getCateList()
  },
  //   计算属性
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>
<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 20px;
}
</style>
